Build and install cmsis_nn pybinds with executorch

[Erik-Lundell]

The package is not available on pypi, and is needed aot. Therefore, add it as a BuiltExtension in setup.py, and wire the cmake up to build it by default with the pybind.cmake preset, that is used when building the executorch wheel.

A pip installation of cmsis_nn can still be used in backends.cortex_m.library.cmsis_nn as a backup.

Tested in all wheel smoke tests.

Additionally:

• Move cmsis_nn build into the cortex_m build folder
• Remove git+pip cmsis_nn install path, deprecating the --disable-cortex-m-deps flag in setup.sh
• Remove pyproject.toml additional dependencies [cortex_m], since cmsis_nn is now included with executorch.
• CMSIS-NN requires pybind11 as a python dependency.

From a local test, the new dependency adds

• 5 sec to a configure time of ~15s
• 3 sec to a build time of ~10 min

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @robell @rascani

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20531

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 2 New Failures, 4 Unrelated Failures, 4 Unclassified Failures

As of commit cd8a1e1 with merge base 6021a58 ():

NEW FAILURES - The following jobs have failed:

• trunk / test-models-macos-coreml (ic4) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• trunk / test-models-macos-coreml (mobilebert) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

UNCLASSIFIED FAILURES - DrCI could not classify the following jobs because the workflow did not run on the merge base. The failures may be pre-existing on trunk or introduced by this PR:

• Build Aarch64 Linux Wheels / pytorch/executorch / build-wheel-py3_10-cpu-aarch64 (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  /__w/executorch/executorch/pytorch/executorch/backends/apple/coreml/runtime/inmemoryfs/inmemory_filesystem.cpp:722:48: error: ‘inmemoryfs::InMemoryFileSystem::InMemoryNode::Kind’ has not been declared
• Build Aarch64 Linux Wheels / pytorch/executorch / upload / upload-wheel-py3_10-cpu-aarch64 (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.10_cpu_aarch64
• Build Windows Wheels / pytorch/executorch / build-wheel-py3_10-cpu (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  ImportError: DLL load failed while importing _portable_lib: The specified module could not be found.
• Build Windows Wheels / pytorch/executorch / upload / upload-wheel-py3_10-cpu (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.10_cpu_x64

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-models-linux (linear, portable, linux.2xlarge) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.

BROKEN TRUNK - The following jobs failed but was present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / windows / windows-job (gh) (trunk failure)
  Process completed with exit code 2.
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  Process completed with exit code 2.
• trunk / unittest-release / windows / windows-job (gh) (trunk failure)
  Process completed with exit code 2.

This comment was automatically generated by Dr. CI and updates every 15 minutes.